Comparison of microtensile bond strength of a resin composite to enamel conditioned by acid etching and Er,Cr:YSGG laser in human primary teeth
November 2014
Abstract
Aim
This
study was designed to compare the bond strength of composite resin
restorations on the buccal surface of primary human canine after
conditioning by conventional acid etching and Er,Cr:YSGG laser.
Methods
Twenty
sound primary canines were cut buccolingually into two halves and each
half was randomly placed in Er,Cr:YSGG laser or acid etch group. The
samples in the acid etch group were etched with 37 % phosphoric acid for
30 s. The samples in the laser group were prepared by Er,Cr:YSGG laser.
The G6-Tips and 600 µm diameter were used with a 1.5 W of power output,
pulse duration of 140 µs and repetition rate of 20 Hz. The bonding
agent was applied on the buccal surface of each sample and layers of
resin composite were placed. The samples’ bond strengths were evaluated
by a microtensile test instrument.
Results
The
mean of microtensile bond strength was 18.55 ± 6.41 in the laser group
and 24.62 ± 5.56 in acid etch group. Microtensile bond strength achieved
by laser conditioning was significantly lower than microtensile bond
strength achieved by the conventional acid etching. Statistics To compare the results between the acid etch and laser group, the paired t test was performed (p value < 0.001).
Conclusion
Conditioning
enamel in primary teeth by Er,Cr:YSGG laser, cannot be used as an
alternative method for acid etching and cannot substitute this
conventional method.
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